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Old 09-11-2012, 05:24 PM   #1 (permalink)
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Turbulence dissipation for boundry layer control

I stumbled across something today.

The theory is valid but the only thing I can find on it so far is written by the guy who invented it.

It works by stealing energy from the turbulence in the boundary layer and dissipates it in a way to break up the turbulence vortex. This keeps the growth of the boundary layer down and thus reduces drag.

http://www.sinhatech.com/AIAA-2006-3030-245.pdf

I'll dig some more. It might belong in the unicorn coral but I wouldn't put it there just yet.

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Old 09-11-2012, 07:12 PM   #2 (permalink)
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Okay no unicorn coral for this. I found other research on it but can't download the articles

http://ntrs.larc.nasa.gov/search.jsp...8%2B4294874261

Kireiko, G. V. 1991 Interaction of wall turbulence with a compliant surface. Fluid Dyn. 25, 550.
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Old 09-11-2012, 08:17 PM   #3 (permalink)
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Interesting stuff. The only issue I see with this is it is for laminar boundary layer applications found on aircraft. Automobiles and such do not live in this realm. I'm 99% sure 99% of the time the air flowing over road vehicles is in a turbulent state, so this simply becomes non applicable to motor vehicles in ground effect.
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Old 09-11-2012, 09:02 PM   #4 (permalink)
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Quote:
Originally Posted by ChazInMT View Post
Interesting stuff. The only issue I see with this is it is for laminar boundary layer applications found on aircraft. Automobiles and such do not live in this realm. I'm 99% sure 99% of the time the air flowing over road vehicles is in a turbulent state, so this simply becomes non applicable to motor vehicles in ground effect.
I'd agree except for this, from the Sinha paper's references:

It seems to not be available online yet...
-mort
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Old 09-11-2012, 09:20 PM   #5 (permalink)
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Quote:
Originally Posted by ChazInMT View Post
Interesting stuff. The only issue I see with this is it is for laminar boundary layer applications found on aircraft. Automobiles and such do not live in this realm. I'm 99% sure 99% of the time the air flowing over road vehicles is in a turbulent state, so this simply becomes non applicable to motor vehicles in ground effect.
On a larger scale most flow on a car is laminar. On a microscopic scale all flow along a surface is turbulent. This is applicable to cars and is being applied to semis for drag reduction.
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Old 09-11-2012, 10:59 PM   #6 (permalink)
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On a larger scale most flow on a car is laminar. On a microscopic scale all flow along a surface is turbulent. This is applicable to cars and is being applied to semis for drag reduction.
Oh Gosh, Sorry, My mistake. Cover your cars and semi's with these quick. Discuss amongst yourselves.
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Old 09-12-2012, 12:30 PM   #7 (permalink)
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Discuss amongst yourselves.
How about we discuss this openly since that is what a forum is for?

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